I completely agree that the linuxtv wiki should not be an advertisement platform, but deleting everything and blocking the user is IMHO not the right solution.

AFAIK this wiki is supposed to be (as far as possible) a one stop shop for people who look for information about tv on linux. For stuff that is not covered by the current kernel drivers we also point people to external projects. Like for support for their Em2880/Em2870 based USB DVB-T devices.

Instead of removing the apparently biased information, it should be replaced by more objective information. CityK already started that. E.g. on the Sundtek page.

In regard to the user that you blocked. Did you try to get in touch with him? I see that you can't send an email to him via the wiki but there's always the User page and a User_Talk page. IMHO blocking a user should be the last resort.